Riveting device



March 20, 1934.

H. JUNKERS nxvn'uue nsvxcs Filed Nov. 23. 1931 Inventor:

Patented Mar. 20, 1934 UNITED STATES PATENT orrlcs Application November 23, 1931, Serial No. 576,796 In Germany December 17, 1930 3 Claims.

My invention refers to the riveting of tubes and more especially to a tube riveting device of the type disclosed in my U. S. Patent 1,752,799, dated April 1, 1930, according to which an anvil 01' a relatively substantial mass is inserted in the tube and held in position therein by resilient holding means. The anvil by virtue of the resilient holding means is apable of delivering blows upon the inner end of a rivet incident to its reaction following blows applied to the outer end of the rivet.

In devices of this kind it has been found that the anvil; particularly if moved along within the tube 'by cables, has a tendency to become disaligned so that seizing of the cables at the anvil or the cable sheaves may occur, and it is then diflicult'to re-align the anvil. Furthermore an anvil of the kind described cannot be adapted to structures having tubes of various inside diameters nor to tapering tubes, because the resilient holding means make up for the variations in the diameter only under undesirable increase of the spring tension by which the anvil is applied to the tube, or are incapable of making up for the 5 variations at all.,

It is an object of my invention to eliminate the tendency to disalignm'ent of the anvil as well as the difliculties involved by various inside diameters of the tubes.

To this end I provide a rail on which the anvil is mounted to slide, in combination with resilient holding means connected with the anvil which bear on the rail.

The rail is held in a fixed position in the tube near its ends and variations in the inside diameter of the tube are made up for by varying the position of the rail with respect to the axis of the tube. The depth of the rail must obviously be so determined that the device can be inserted 0 in a tube having the smallest inside diameter.

The necessity of providing separate devices for various inside diameters is thereby eliminated.

In the drawing affixed to this specification and forming part thereof a riveting device embody- 5 ing my invention is illustrated diagrammatically by way of example.

In the drawing 7 Fig. 1 is a longitudinal section of two tapering tubes with the riveting device in position at the joint-and Fig.- 2 is a section on the line II-II in Fig. 1.

Referring now to the drawing, 1 and 2 are the two tapering tubes which are to be connected at their ends by overlapping through rivets 4. 3 is a rail inserted in the tubesand mounted near their ends so as to extend substantially in parallel to the joint where the rivets 4 are inserted as shown at the left. 5 is an anvil which is mounted to slide on the rail 3 with a groove 10, 6 and 7 are cables for moving the anvil along the rail, and 8, 9 are the resilient holding means, here shown as U-shaped springs of steel wire, which tend to apply the anvil 5 tothe wall of the tube.

In operation rivets 4 are inserted through holes in the joint against the reaction of the springs 8, 9. Blows applied to the outer ends of the rivets impart movement to the anvil 5 and the inertia of the anvil counteracting the movements causes upsetting of the rivet shanks into heads as shown for the two rivets at the right.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.v

In the claims aflixed to this specification no selection of any particular modification of the invention is intended to the exclusion of other modificaions thereof and the right to subsequently make claim to any modification not covered by these claims is expressly reserved.

I claim: I

1. Means for riveting tubes and other hollow bodies comprising a rail adapted to be fixed in position within the hollow body and extending longitudinally thereof, an anvil retained on said rail against lateral displacement and slidable thereon longitudinally of the hollow body, and resilient means secured to said anvil and bearing on said rail for holding said anvil applied against the inner wall of said body in such manner .as to give way to the pressure of a rivet introduced through a hole in such wall, said anvil consisting of a relatively substantial mass which by virtue of said resilient holding means is capable of delivering blows upon the inner end of the rivet incident to its reaction following blows applied to the outer end of the rivet.

2. Means for riveting tubes and other hollow bodies comprising a rail adapted to be fixed in position within the hollow body and extending longitudinally thereof, an anvil retained on said rail against lateral displacement and slidable thereon longitudinally of the hollow body, resilient means secured to said anvil and bearing on said rail for holding said anvil applied against the inner wall of said body in such manner as to give way to the pressure of a rivet introduced through a hole in such wall, and means for moving said anvil along said rail, said anvil consisting of a relatively substantial mass which by virtue of said resilient holding means is capable of delivering blows upon the inner end of the rivet incident to its reaction following blows applied to the outer end of the rivet.

3. Means for riveting tubes and other hollow bodies comprising a rail adapted to be fixed in position within the hollow body and extending longitudinally thereof, an anvil retained on said.

' rail against lateral displacement and slidable thereon longitudinally of the hollow body, resilient means secured to said anvil and bearing on 

